I flush my membrane for about 5 minutes after I've made water. June at Gaps Water said this was fine.
I think with 'backflushing' you're referring to an Ionics system or similar with maybe a manual water softener. You have to maually regenerate the softener resin with salt and backwash. I've heard people refer to this before. Bit confusing All you're doing is just regenerating your softener resin with the salt. This can take an hour or so.